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<div style="-webkit-text-size-adjust: auto; ">Hi Tom,</div>
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<div style="-webkit-text-size-adjust: auto; ">In McDoc -> component library index you can find the short documentation for every McStas component, including PowderN. (Also available here: <span style="font-family: '.HelveticaNeueUI'; font-size: 15px; line-height: 19px; white-space: nowrap; -webkit-tap-highlight-color: rgba(26, 26, 26, 0.296875); -webkit-composition-fill-color: rgba(175, 192, 227, 0.230469); -webkit-composition-frame-color: rgba(77, 128, 180, 0.230469); -webkit-text-size-adjust: none; "><a href="http://mcstas.org/download/components/samples/PowderN.html">http://mcstas.org/download/components/samples/PowderN.html</a>
- from McStas 2.0).</span></div>
<div><font face=".HelveticaNeueUI"><span style="font-size: 15px; line-height: 19px; white-space: nowrap; -webkit-tap-highlight-color: rgba(26, 26, 26, 0.292969); -webkit-composition-fill-color: rgba(175, 192, 227, 0.230469); -webkit-composition-frame-color: rgba(77, 128, 180, 0.230469);"><br>
</span></font></div>
<div><font face=".HelveticaNeueUI"><span style="font-size: 15px; line-height: 19px; white-space: nowrap; -webkit-tap-highlight-color: rgba(26, 26, 26, 0.292969); -webkit-composition-fill-color: rgba(175, 192, 227, 0.230469); -webkit-composition-frame-color: rgba(77, 128, 180, 0.230469);">A
quick look at the table in that documentation will reveal the 'frac' parameter in McStas 1.12c or the 'p_inc' parameter in McStas 2.0, which should be used to assign at fraction of your statistics to scatter incoherently.</span></font></div>
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</span></font></div>
<div><font face=".HelveticaNeueUI"><span style="font-size: 15px; line-height: 19px; white-space: nowrap; -webkit-tap-highlight-color: rgba(26, 26, 26, 0.292969); -webkit-composition-fill-color: rgba(175, 192, 227, 0.230469); -webkit-composition-frame-color: rgba(77, 128, 180, 0.230469);">Best,</span></font></div>
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<div><font face=".HelveticaNeueUI"><span style="font-size: 15px; line-height: 19px; white-space: nowrap; -webkit-tap-highlight-color: rgba(26, 26, 26, 0.292969); -webkit-composition-fill-color: rgba(175, 192, 227, 0.230469); -webkit-composition-frame-color: rgba(77, 128, 180, 0.230469);">Peter<br>
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<div style="margin: 0cm 0cm 0.0001pt; "><b>Technical University of Denmark<o:p></o:p></b></div>
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<div style="margin: 0cm 0cm 0.0001pt; "><b>Department of</b><b> Physics</b><o:p></o:p></div>
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<div style="-webkit-text-size-adjust: auto; "><br>
Den 28/04/2013 kl. 04.44 skrev "陈彦舟" <<a href="mailto:wokaoyan1981@126.com">wokaoyan1981@126.com</a>>:<br>
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<blockquote type="cite" style="-webkit-text-size-adjust: auto; ">
<div><span>Hi all,</span><br>
<span> I set the parameter “sigma_inc” of PowderN component as 0.4, but no platform background is found!</span><br>
<span> Then I set it much more larger as 400 on purpose, no platform background is found either ( In this case, more peaks are observed.)</span><br>
<span></span><br>
<span> Could you please shed light on it?</span><br>
<span></span><br>
<span> SPLIT 10 COMPONENT sample = PowderN(</span><br>
<span> reflections = "Fe.laz", radius = 0.005,</span><br>
<span> yheight = 0.1, Vc = 23.55, sigma_abs = 2.56, sigma_inc = 0.4)</span><br>
<span> AT (0, 0, 0.05) RELATIVE virtual_out</span><br>
<span></span><br>
<span>Best wishes,</span><br>
<span>Tom</span><br>
<span></span><br>
<span></span><br>
<span></span><br>
<span></span><br>
<span></span><br>
<span></span><br>
<span></span><br>
<span></span><br>
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</blockquote>
<blockquote type="cite" style="-webkit-text-size-adjust: auto; ">
<div><sigma_inc400.bmp></div>
</blockquote>
<blockquote type="cite" style="-webkit-text-size-adjust: auto; ">
<div><ATT00001.c></div>
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